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powerpc: Index crit/dbg/mcheck stacks using cpu number on 64bit 

In exc_lvl_ctx_init() we index into the crit/dbg/mcheck stacks using
the hard cpu id, but that assumes the hard cpu id is zero based and
contiguous. That is not the case on A2.

The root of the problem is that the 32bit code has no equivalent of the
paca to allow it to do the hard->soft mapping in assembler. Until the
32bit code is updated to handle that, index the stacks using the soft
cpu ids on 64bit and hard on 32 bit.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2011-04-14 22:32:04 +00:00 committed by Benjamin Herrenschmidt
parent bd49178109
commit ca1769f7a3
1 changed files with 15 additions and 11 deletions
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26
arch/powerpc/kernel/irq.c
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@ -397,24 +397,28 @@ struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
void exc_lvl_ctx_init(void)
{
struct thread_info *tp;
int i, hw_cpu;
int i, cpu_nr;
for_each_possible_cpu(i) {
hw_cpu = get_hard_smp_processor_id(i);
memset((void *)critirq_ctx[hw_cpu], 0, THREAD_SIZE);
tp = critirq_ctx[hw_cpu];
tp->cpu = i;
#ifdef CONFIG_PPC64
cpu_nr = i;
#else
cpu_nr = get_hard_smp_processor_id(i);
#endif
memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
tp = critirq_ctx[cpu_nr];
tp->cpu = cpu_nr;
tp->preempt_count = 0;
#ifdef CONFIG_BOOKE
memset((void *)dbgirq_ctx[hw_cpu], 0, THREAD_SIZE);
tp = dbgirq_ctx[hw_cpu];
tp->cpu = i;
memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE);
tp = dbgirq_ctx[cpu_nr];
tp->cpu = cpu_nr;
tp->preempt_count = 0;
memset((void *)mcheckirq_ctx[hw_cpu], 0, THREAD_SIZE);
tp = mcheckirq_ctx[hw_cpu];
tp->cpu = i;
memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE);
tp = mcheckirq_ctx[cpu_nr];
tp->cpu = cpu_nr;
tp->preempt_count = HARDIRQ_OFFSET;
#endif
}